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NORAD ID: 44073
Int'l Code: 2019-016 A
Perigee: 421.8 km
Apogee: 435.6 km
Inclination: 39.5 °
Period: 93.0 minutes
Semi major axis: 6799 km
RCS: Unknown
Launch date: February 28, 2019
Source: United States (US)
Launch site: Rocket Lab Launch Complex (RLLC)

R3D2 (Radio Frequency Risk Reduction Deployment Demonstration) is a DARPA mission to space-qualify a new type of membrane reflectarray antenna. The antenna, made of a tissue-thin Kapton membrane, packs tightly for stowage during launch and then will deploy to its full size of 2.25 meters in diameter once it reaches low Earth orbit.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 44073U 19016A   19326.39222204 -.00000233  00000-0  00000+0 0  9998
2 44073  39.5189  72.6797 0010114 334.3083  25.7867 15.48342356 36920
Source of the keplerian elements: AFSPC